S
M
T
W
T
F
S
26
92°
75°
27
93°
75°
28
92°
76°
29
92°
75°
30
91°
75°
31
91°
74°
1
92°
75°
2
91°
75°
3
88°
74°
4
87°
75°
5
88°
74°
6
89°
73°
7
91°
74°
8
92°
74°
9
91°
74°
10
92°
73°
11
93°
74°
12
92°
73°
13
93°
74°
14
92°
74°
15
92°
73°
16
90°
74°
17
90°
73°
18
89°
74°
19
89°
74°
20
90°
73°
21
91°
74°
22
92°
73°
23
92°
73°
24
91°
74°
25
92°
73°
26
91°
73°
27
90°
74°
28
88°
74°
29
88°
73°
30
89°
72°
31
88°
73°
1
89°
72°
2
89°
73°
3
90°
72°
4
89°
72°
5
89°
73°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in San Antonio
San Antonio's August 2026 forecast shows daily high temperatures ranging from 87° to 93°, with overnight lows between 72° and 76°. The average high for August is 90° with an average low of 74°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in San Antonio. See also: September | October | November.
